Why is my cloud explosion white?
As You could see on the picture below, the Scatter Color value (green circle) is the point of your interest. Changing this values leads to different cloud scatter colour. Please keep in mind that scatter colour settings is reversed so if You want a red clouds You have to lower the red value.

(values used on the image: R=0.55, G=0.62, B=0,65)



Hope it helps You, Buddy.